scholarly journals Nonadiabatic rate constants for proton transfer and proton-coupled electron transfer reactions in solution: Effects of quadratic term in the vibronic coupling expansion

2015 ◽  
Vol 143 (19) ◽  
pp. 194101 ◽  
Author(s):  
Alexander V. Soudackov ◽  
Sharon Hammes-Schiffer
Keyword(s):  
Electron Transfer ◽  
Proton Transfer ◽  
Rate Constants ◽  
Vibronic Coupling ◽  
Transfer Reactions ◽  
Quadratic Term ◽  
Electron Transfer Reactions ◽  
Proton Coupled Electron Transfer

scholarly journals Concerted proton-electron transfer reactions in the Marcus inverted region

Science ◽  
2019 ◽  
Vol 364 (6439) ◽  
pp. 471-475 ◽  
Author(s):  
Giovanny A. Parada ◽  
Zachary K. Goldsmith ◽  
Scott Kolmar ◽  
Belinda Pettersson Rimgard ◽  
Brandon Q. Mercado ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Inverted Region ◽  
Electron Transfer Reactions ◽  
Proton Coupled Electron Transfer ◽  
Marcus Inverted Region ◽  
A Charge ◽  
Theory Yield

Electron transfer reactions slow down when they become very thermodynamically favorable, a counterintuitive interplay of kinetics and thermodynamics termed the inverted region in Marcus theory. Here we report inverted region behavior for proton-coupled electron transfer (PCET). Photochemical studies of anthracene-phenol-pyridine triads give rate constants for PCET charge recombination that are slower for the more thermodynamically favorable reactions. Photoexcitation forms an anthracene excited state that undergoes PCET to create a charge-separated state. The rate constants for return charge recombination show an inverted dependence on the driving force upon changing pyridine substituents and the solvent. Calculations using vibronically nonadiabatic PCET theory yield rate constants for simultaneous tunneling of the electron and proton that account for the results.

Proton transfer dynamics dictate quinone speciation at lipid-modified electrodes

2017 ◽  
Vol 19 (10) ◽  
pp. 7086-7093 ◽  
Author(s):  
Edmund C. M. Tse ◽  
Christopher J. Barile ◽  
Ying Li ◽  
Steven C. Zimmerman ◽  
Ali Hosseini ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Proton Transfer ◽  
Alternative Energy ◽  
Modified Electrodes ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Proton Coupled Electron Transfer

Proton-coupled electron transfer reactions are ubiquitous in biochemistry and alternative energy schemes.

ChemInform Abstract: Energy Transfer, Proton Transfer, and Electron Transfer Reactions Within Zeolites

ChemInform ◽  
2010 ◽  
Vol 30 (8) ◽  
pp. no-no
Author(s):  
V. Ramamurthy ◽  
P. Lakshminarasimhan ◽  
Clare P. Grey ◽  
Linda J. Johnston
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Proton Transfer ◽  
Transfer Reactions ◽  
Electron Transfer Reactions
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